Question

А)100 $x^{2}$ - 160х +63 =0
б) - $x^{2}$ - 5х +14 =0
в) -3 $x^{2}$ - 2х + 5 =0
г) $x^{2}$ =2х + 48
д)6 $x^{2}$ + 7х =5

Answer 1

100х² - 160х +63 =0
D=25600-25200=20²
x₁=(160+20)/200=0.9
x₂=(160-20)/200=0.7

  -х² - 5х +14 =0
D=25+56=9²
x₁=(5+9)/-2=-7
x₂=(5-9)-2=2

  -3х² - 2х + 5 =0
D=4+60=8²
x₁=(2+8)/-6=-1 2/3
x₂=(2-8)/-6=1

  х²=2х + 48
x²-2x-48=0
D=4+192=14²
x₁=(2+14)/2=8
x₂=(2-14)/2=-6

6х² + 7х =5
6x²+7x-5=0
D=49+120=13²
x₁=(-7+13)/12=0.5
x₂=(-7-13)/12=-1 2/3